Cornflower (Centaurea cyanus) has a long history of use in traditional herbal medicine, particularly in Europe. Its flowers have been included in herbal remedies aimed at supporting urinary tract health and alleviating mild bladder discomfort. Traditionally, cornflower infusions or teas were believed to have mild diuretic properties, promoting urine flow and purportedly aiding in the elimination of waste products from the bladder and urinary tract. Historical herbal texts from the 16th to 19th centuries mention cornflower in the context of supporting kidney and bladder function, though these uses were often based on anecdotal reports or empirical observations rather than systematic clinical studies.

Scientifically, however, there is limited contemporary research directly supporting cornflower for bladder health. Most available studies focus on its antioxidant, anti-inflammatory, and mild diuretic effects in vitro or in animal models, with very few human trials addressing urinary or bladder conditions. Therefore, while the tradition of using cornflower for bladder support exists, substantial scientific validation is lacking. The strength of evidence is modest and mainly historical, warranting a cautious approach to its use for this body system.